Bring a large pot of lightly salted water to a boil.
Add ziti pasta, and cook until al dente, about 8 minutes; drain.
In a large skillet, brown onion, garlic, and ground beef over medium heat.
Add spaghetti sauce, and simmer 15 minutes.
Preheat the oven to 350.
Spray a 9x13 inch baking dish with non stick cooking spray Layer as follows: 1/2 of the ziti, Provolone cheese, Ricotta, 1/2 sauce mixture, remaining ziti, mozzarella cheese and remaining sauce mixture.
Cover with foil.
Bake for 35 minutes in the preheated oven.
Remove from oven and remove foil.
Sprinkle with Parmesan cheese and return to oven uncovered.
Bake 5 minutes more or until cheese is golden brown.
*Increasebaking time if made ahead and refrigerated.